KIP-1202 — Align broker and controller "advertised.listeners" and "listeners" behaviour

Discussion BrokerKRaft

Aligns broker and controller behavior for advertised.listeners: when listeners is set to 0.0.0.0, brokers will now auto-infer advertised.listeners (replacing 0.0.0.0 with null/hostname) instead of throwing IllegalArgumentException, matching the existing controller behavior. The asymmetry meant operators had to remember that controllers tolerate 0.0.0.0 in listeners but brokers require explicit advertised.listeners, complicating configuration templates.

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